Convertible trunk size

I have seen several magazine articles which state that, with the top down, the trunk only has a little over 5 cubic feet of space. The C5 has over 10 cubic feet with the top down. Can the difference be this great. A Miata will have more trunk space than a C6 if this is true! It will make the convertible useless for trips and will make me look elsewhere when I decide to trade in my C5 convertible. Does anyone know the real specs on C6 convertible trunk size?

To get the new Euro-friendly 5-inch shorter length, it looks like trunk space was sacrificed. Personally, I like the shorter length and shorter overhangs. But I'm not looking at a vert, the removable top coupe is what I want.

To get the new Euro-friendly 5-inch shorter length, it looks like trunk space was sacrificed. Personally, I like the shorter length and shorter overhangs. But I'm not looking at a vert, the removable top coupe is what I want.

Drat! I got rid of 2 C4 Verts (which I dearly loved) because of lack of cargo space for road trips. For comparision, how much did coupe space change?